I like both of them, for different reasons. I like CK because it seems to add lots of extra definition for me and reduced frizz quite a bit. I'm one to layer one or two products together, and I love that CK layers with anything. It's also really easy to distribute, which is great for a clutz like me. The scent isn't my favorite, but after it dries I don't notice it.
RR is really good for curl enhancement, but the drawback is that I need a lot of it to distribute through my hair. It works pretty well with either a gel or with the CCSS
for me, though I do have a hard time figuring out how much of each to use. I've had a lot of great hair days with RR, though, and I love Jessicurl's scents.